The Magicians Apprentice was about someone from the low end of society manifesting magical power and how that completely messes up the balance of the whole system.

It was impossible to imagine the aloof, dignified, powerful High Lord living as, of all things, a slave.

What was I thinking? Of all the assistants I could have wound up with, why did I have to choose the one with the scary mother and troublemaking in his bloodlines? I am doomed.

Inspiration comes from so many sources. Music, other fiction, the non-fiction I read, TV shows, films, news reports, people I know, stories I hear, misheard words or lyrics, dreams

He had given her too much. He had given her everything.

Happy endings are a luxury of fiction

The first rule of world-building is available physics, which basically means that if you want it to feel real, it has to follow the same rules as this world, from gravity to how human behaviour works. If you have a fantasy element that doesnt obey the laws of physics, make sure that it has a fantasy explanation.